The most common and most likely answer to this crossword clue is the 3 letter word LEO
L
E
O
More clues leading to the result LEO
- Sign in trouble, ominously
- The French love a group of stars
- Origins of life evidently offering a sign
- Look round everywhere, initially for a sign of summer
- See about beginning to erect sign
- Look round bottom of lane for a sign
- Fellow the French love
- A sign of pride?
- A selection of notable Oscar stars
- Found in whole of house
Buddy explains!

The straight part
We know that "a group of stars" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a group of stars = leo.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.